Asphalt pavement.



UNITED STATES JOSEPH II. AMIES, OF- PHILADELPHIA,

PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO CHARLES FREMONT TAYLOR, OF SAMEPLACE.

ASPHALT PAVEMENT.

SPEGZFIGATION forming part of Letters Patent No. 684,164, dated October8, 1901.

Application filed February 14, 1901.

T0 (LZZ whom it may concern:

Be it known that I, J OSEPH HAY AMIES, a citizen of the United States ofAmerica, and a resident of Philadelphia, county of Philadelphia,Pennsylvania, have invented certain new and useful Improvements inAsphalt Pavements, of which the following is a specification.

Hy invention has for its object the cheapening of the process of layingsheet-asphalt streets,with the further object of making said laying moreconvenient and with the still further object of extending the life ofthesaid sheet-asphalt streets.

My process is as follows: I take sand or ground stone or slag, or all ofthem, and dampen the mass with naphtha, benzin, gasolene, headlight-oil,or any other suitable light oil, or I mix-these with a heavier oil, suchas residuum oil, for the purpose of procuring a stronger fuel element.When said mineral matter is thoroughly coated with the said oil, and inaddition a sufficient quantity of the oil has been mixed with the same,(the quantity will vary according to the temperature and weather,) Iignite the gases emanating from the mass,which I turn over and over inorder that the air may have free access thereto, or I may use a methodof forcing air through the same in order to increase the heat by alarger consumption of oxygen. My object is to quickly and thoroughlyheat the mineral matter to an intense degree. My process facilitatesthis, because the oil coats the grains of mineral matter, and if air isforced among said grains the blue flame created thereby, and which isvery hot, will very rapidly heat the same. It is a much quicker andcheaper method than by radiation. Having thus quickly and cheaply heatedthe mass, I have at hand asphalt ground to a fine dust, which I sprinkleon the hot mineral matter and thoroughly mix therewith. The fineasphalt-dust is instantly melted by the heat of the hot minerals, andwhen they are thus and in due proportion coated with the asphalt I 'tiveand satisfactory result.

Serial No 47,206. (No specimens.)

add a quantity of fluxing material, such as residuum or rosin oil, torender the pavement elastic, and mix this through the mass. I then addthe right proportion of carbonate of lime and spread the compositionupon the road-bed and roll it until all the said ingredients have beenthoroughly incorporated, the heat remaining in the mass, assuring aposi= The above-described pavement composi tion is ofcourse laid downupon a properlyprepared bed, such as is commonly used as the base forsheet-asphalt pavements. The said composition increases the endurance of6c asphalt-street wear. Grinding asphalt to a dust does not injure it,and when said granulated asphalt comes into contact with said hotgranulated minerals it is instantly melted by a heat not intense enoughto harm it or cause deterioration, besides it is subject to this heatbut for a short time and under the conditions of being gradually cooled.

Having now described my invention, what I claim as new is Thewithin-described process of making sheet-asphalt pavements, whichconsists in mixing granulated mineral matter with an inflammable oilycomposition, igniting the gases therefrom and causing the heat therebygenerated to be thoroughly applied to said granulated mineral matteruntil same becomes heated to an intense degree, then mingling with thesaid hot mineral matter granulated asphalt, and blending both bystirring until the mass becomes plastic, then adding, while still hot, afiuxing agent and carbonate of lime, and then spreading the product uponthe street and compacting and finishing the pavement by rolling andtamping in the usual manner, substantially as described.

Signed at Philadelphia this 13th day of February, 1901.

JOSEPH H. AMIES.

Witnesses:

J AS. W. ROBERTSON, JAMES P. Pnrrr.

